Differential pressure switching valve

Abstract

Provided is a differential pressure switching valve capable of switching a flow path at an appropriate timing. The present invention is provided with a low-pressure inflow port (P3), a high-pressure outflow port (P4), a first port (P1), and a second port (P2), differential pressure on-off valves (2, 3) being provided in a flow path between the low-pressure inflow port (P3) and the first port (P1) and a flow path between the low-pressure inflow port (P3) and the second port (P2), the high-pressure outflow port (P4) communicating with the first port (P1) and the second port (P2), and the first port (P1) and the second port (P2) communicating with the high-pressure outflow port (P4) communicating with the first port (P1) and the second port (P2). Differential pressure on-off valves (3, 4) are provided for switching the flow path to the high-pressure outflow port (P4) in accordance with the pressure of the first port (P1) and the second port (P2).

Description

TECHNICAL FIELD

[0001] The present application relates to a differential pressure switching valve, for example, a differential pressure switching valve that switches a flow path for fluid flow. BACKGROUND

[0002] In various industrial fields, a fluid circuit in which a fluid supply source and a fluid load such as a fluid working device, a heat exchanger, and the like are connected by a flow path is used. Such a fluid circuit sometimes realizes a plurality of modes in which the fluid load is operated by one fluid circuit by providing a switching valve that switches the flow path of the working fluid.

[0003] For example, the fluid circuit of Patent Literature 1 is mainly composed of a compressor, a first switching valve, an outdoor heat exchanger, a second switching valve, a first pressure reducing device, a gas-liquid separator, a second pressure reducing device, and an indoor heat exchanger. The first switching valve is a four-way valve that switches the direction of flow of refrigerant by external power depending on whether the refrigeration operation or the heating operation is performed.

[0004] The second switching valve is a four-way valve that switches the direction of flow of refrigerant by external power so that high-pressure refrigerant flowing into the second switching valve from the outdoor heat exchanger or the indoor heat exchanger flows into the heat exchanger that has not passed through after sequentially passing through the first pressure reducing device, the gas-liquid separator, and the second pressure reducing device.

[0005] Thus, the fluid circuit of Patent Literature 1 can recover gas-phase refrigerant that contributes little to heat absorption by the gas-liquid separator regardless of whether the refrigeration operation or the heating operation is performed, and can cause liquid-phase refrigerant that contributes to heat absorption to pass through the outdoor heat exchanger or the indoor heat exchanger preferentially, and thus can improve the capacity of refrigeration and heating.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: Japanese Patent Application Laid-Open No. 2001-241797 (pages 4 and 5, FIG. 1) Figure 1 ) SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] Thus, as long as the fluid circuit has the second switching valve like that of Patent Literature 1, the fluid can be caused to flow into the appropriate direction or the second device after the fluid passes through the prescribed direction or the first device regardless of the mode of operation.

[0011] However, when switching the operation mode while operating, if the first four-way valve and the second four-way valve are switched using external power at the same time, although the refrigerant after passing through the second switching valve is high pressure, since the heat exchanger side is connected to the low pressure refrigerant flowing thereto, the refrigerants of the two flow paths are mixed, the pressure of the two flow paths cannot be maintained at a prescribed pressure, and thus the efficiency of the refrigeration cycle can be decreased. In order to maintain the pressure of the two flow paths at a prescribed pressure, the timing of switching the first four-way valve and the second four-way valve needs to be controlled individually according to the pressure change of the refrigerant of each device.

[0012] The present application has been made in view of the above problems, and has an object to provide a differential pressure switching valve capable of switching flow paths at an appropriate timing.

[0013] Means for solving the problems

[0014] To solve the above problems, the differential pressure switching valve of the present application has a low pressure inflow port, a high pressure outflow port, a first port, and a second port, differential pressure opening and closing valves are respectively provided on a flow path between the low pressure inflow port and the first port and a flow path between the low pressure inflow port and the second port, the high pressure outflow port is in communication with the first port and the second port, and the differential pressure switching valve is provided with a differential pressure opening and closing valve that switches a flow path flowing to the high pressure outflow port according to the pressure of the first port and the second port.

[0015] Thus, the flow path is switched using the pressure difference caused by the pressure change of the fluid of the first port and the fluid of the second port, and thus switching control using special power is not needed.

[0016] The differential pressure opening and closing valve provided on the flow path between the low pressure inflow port and the first port and the differential pressure opening and closing valve provided on the flow path between the low pressure inflow port and the second port can be check valves, respectively.

[0017] Thus, the configuration can be made simple.

[0018] The two check valves can be arranged in a direction that prevents inflow from the first port and the second port to the low pressure inflow port.

[0019] Thus, the flow path in communication with the low pressure inflow port can be switched by a simple configuration.

[0020] The differential pressure opening and closing valves can be check valves respectively provided on a flow path between the high pressure outflow port and the first port and a flow path between the high pressure outflow port and the second port.

[0021] Thus, the configuration can be made simple.

[0022] Also, 2 of the check valves can be arranged in a direction that prevents inflow from the high-pressure outflow port to the 1st port and the 2nd port.

[0023] Thus, the flow path that communicates with the high-pressure outflow port can be switched by a simple structure.

[0024] Also, all of the differential pressure opening / closing valves can be arranged in one housing.

[0025] Thus, attachment and detachment with respect to the fluid circuit is easy. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a cross-sectional view of the differential pressure switching valve of Embodiment 1 of the present application.

[0027] Figure 2 is a cross-sectional view showing a state in which a different flow path is switched in the differential pressure switching valve of Embodiment 1. Figure 1

[0028] Figure 3 is a cross-sectional view of the differential pressure switching valve of Embodiment 2 of the present application.

[0029] Figure 4 is a cross-sectional view showing a state in which a different flow path is switched in the differential pressure switching valve of Embodiment 2. Figure 3 DETAILED DESCRIPTION

[0030] Hereinafter, a manner of the differential pressure switching valve for implementing the present application will be described based on an embodiment.

[0031] Embodiment 1

[0032] Referring to Figure 1 , Figure 2 The differential pressure switching valve of Embodiment 1 will be described. Hereinafter, the upper and lower left and right of Figure 1 will be described as the upper and lower left and right of the refrigerant switching valve.

[0033] As shown in Figure 1 , the differential pressure switching valve V1 of the present application is a four-way valve provided in a fluid circuit, and is used to switch the flow direction of a 1st device Fs and a 2nd device Ss in the fluid circuit. In the present embodiment, the pressurization of a fluid flowing in the fluid circuit is performed by a non-illustrated compressor provided in the 1st device Fs, and the depressurization of the fluid is performed by a non-illustrated pressure reducer provided in the 2nd device Ss.

[0034] The differential pressure switching valve V1 is mainly composed of a housing 1, a 1st low-pressure side check valve 2, a 2nd low-pressure side check valve 3, a 1st high-pressure side check valve 4, and a 2nd high-pressure side check valve 5. In addition, in Figure 1 ,​​Figure 2 Each check valve 2, 3, 4, 5 is schematically illustrated in the middle.

[0035] The housing 1 is mainly composed of a base member 10, a low-pressure side branch member 20, a high-pressure side branch member 30, a first side cover member 40, and a second side cover member 50.

[0036] The base member 10 has a base portion 11 formed in a cylindrical shape extending in the left-right direction, four protruding portions 12, 13, 14, 15 protruding outward in the radial direction from the base portion 11, and a partition wall 16.

[0037] The space inside the base portion 11 is divided left and right by the circular-plate-shaped partition wall 16 which is fixed to the inside of the base portion 11 in a sealed manner. The space on the left side of the partition wall 16 is a first side space R1, and the space on the right side of the partition wall 16 is a second side space R2.

[0038] In addition, in the case of arranging the partition wall 16 in a sealed manner in the base portion 11, it is not limited to welding, but a sealing member can be used to arrange it in a sealed manner, or the partition wall and the base portion can be integrally formed, and appropriate changes can be made. The same applies to other components constituting the housing 1.

[0039] The protruding portions 12, 13, 14, 15 are formed in a cylindrical shape. Two protruding portions 12, 13 are provided on the upper side and arranged in a straight line in the left-right direction. The other two protruding portions 14, 15 are provided on the lower side and arranged in a straight line in the left-right direction.

[0040] Furthermore, the protruding portions 12, 14 are provided on the left side of the peripheral wall of the base member 10. The protruding portions 13, 15 are provided on the right side of the peripheral wall of the base member 10.

[0041] The protruding portion 12 inner flow path communicates with the first side space R1. Furthermore, the first low-pressure side check valve 2 is provided on the protruding portion 12 inner flow path. The first low-pressure side check valve 2 is arranged in a direction that prevents fluid from flowing from the first side space R1 to the low-pressure inflow port P3 described later.

[0042] The protruding portion 13 inner flow path communicates with the second side space R2. Furthermore, the second low-pressure side check valve 3 is provided on the protruding portion 13 inner flow path. The second low-pressure side check valve 3 is arranged in a direction that prevents fluid from flowing from the second side space R2 to the low-pressure inflow port P3.

[0043] The protruding portion 14 inner flow path communicates with the first side space R1. Furthermore, the first high-pressure side check valve 4 is provided on the protruding portion 14 inner flow path. The first high-pressure side check valve 4 is arranged in a direction that prevents fluid from flowing from the high-pressure outflow port P4 described later to the first side space R1.

[0044] The flow path inside the protrusion 15 is connected to the second side space R2. Furthermore, a second high-pressure side check valve 5 is provided in the flow path inside the protrusion 15. The second high-pressure side check valve 5 is positioned to prevent fluid from flowing into the second side space R2 from the high-pressure outlet port P4 (described later).

[0045] The low-pressure side branch 20 is formed into an up-and-down flipped Y-shape with a neck 21, a first side arm 22 and a second side arm 23.

[0046] The neck 21 is formed into a cylindrical shape extending in the vertical direction. Furthermore, the lower end of the space within the neck 21 communicates with a space extending in the horizontal direction. That is, the flow path within the neck 21 communicates with the flow paths within the first side arm 22 and the second side arm 23.

[0047] Furthermore, the internal flow path of the neck 21 is connected to the low-pressure flow path S1, which supplies low-pressure fluid depressurized by the second device Ss to flow toward the neck 21. That is, in the internal flow path of the neck 21, the opening connected to the low-pressure flow path S1 is the low-pressure inlet port P3 for the low-pressure fluid to flow in.

[0048] The first side arm 22 is formed as a cylinder extending from the lower left side of the neck 21 in a leftward direction, then bending downward at approximately 90 degrees and extending downward. The first side arm 22 is welded and fixed to the protrusion 12 of the base member 10 in a sealed manner. The flow path inside the first side arm 22 is connected to the flow path inside the protrusion 12.

[0049] The second side arm 23 is formed as a cylinder extending to the right from the lower right end of the neck 21, then bending downwards at approximately 90 degrees and extending downwards. The second side arm 23 is welded and fixed to the protrusion 13 of the base member 10 in a sealed manner. The flow path inside the second side arm 23 is connected to the flow path inside the protrusion 13.

[0050] The high-voltage side branch 30 is formed in a Y-shape with a neck 31, a first side arm 32 and a second side arm 33.

[0051] The neck 31 is formed into a cylindrical shape extending vertically. Furthermore, the upper end of the space within the neck 31 communicates with a space extending horizontally. The flow path within the neck 31 communicates with the flow paths within the first side arm 32 and the second side arm 33.

[0052] Furthermore, the internal flow path of the neck 31 is connected to the high-pressure flow path S2, which supplies high-pressure fluid pressurized by the first device Fs to flow toward the second device Ss. That is, in the internal flow path of the neck 31, the opening connected to the high-pressure flow path S2 is the high-pressure outlet port P4 for the high-pressure fluid to flow out.

[0053] The first side arm 32 is formed as a cylinder extending from the upper left side of the neck 31 in a leftward direction, then bending upward at approximately 90 degrees and extending upward. The first side arm 32 is welded and fixed to the protrusion 14 of the base member 10 in a sealed manner. The flow path inside the first side arm 32 is connected to the flow path inside the protrusion 14.

[0054] The second side arm 33 is formed as a cylinder extending to the right from the upper right side of the neck 31, then bending upward at approximately 90 degrees and extending upward. The second side arm 33 is welded and fixed to the protrusion 15 of the base member 10 in a sealed manner. The flow path inside the second side arm 33 is connected to the flow path inside the protrusion 15.

[0055] The first side cover 40 is formed as a cylindrical shape with a sidewall that is open on the right side in the axial direction and has a sidewall on the left side in the axial direction. The first side cover 40 is welded and fixed to the base 11 of the base member 10 in a sealed manner. Thus, the space inside the first side cover 40 and the space on the left side inside the base 11 together constitute the first side space R1.

[0056] Furthermore, the first side cover 40 has a cylindrical extension 41 extending axially to the left from the center of the side wall. The flow path inside the extension 41 communicates with the first side space R1.

[0057] Furthermore, the flow path within the extension 41 is connected to the first flow path F1 extending from the first device Fs. That is, the opening in the flow path within the extension 41 that connects to the first flow path F1 allows high-pressure fluid to flow in (see reference). Figure 1 Or low-pressure fluid flows out (refer to) Figure 2 Port P1 of the first port is described in detail below.

[0058] The second side cover 50 is formed as a cylindrical shape with a sidewall that is open on the left side in the axial direction and has a sidewall on the right side in the axial direction. The second side cover 50 is welded and fixed to the base 11 of the base member 10 in a sealed manner. Thus, the space inside the second side cover 50 and the space on the right side inside the base 11 together constitute the second side space R2.

[0059] Furthermore, the second side cover 50 has a cylindrical extension 51 extending axially to the right from the center of the side wall. The flow path inside the extension 51 communicates with the second side space R2.

[0060] Furthermore, the flow path within the extension 51 communicates with the second flow path F2 extending from the first device Fs. That is, the opening in the flow path within the extension 51 that communicates with the second flow path F2 is for the outflow of low-pressure fluid (see reference). Figure 1 Or high-pressure fluid flows in (refer to) Figure 2 Port P2 of the ) is detailed below.

[0061] Next, the switching of the flow path of the differential pressure switching valve V1 will be explained. Furthermore, the switching of whether to send high-pressure fluid to the first flow path F1 and draw low-pressure fluid from the second flow path F2, or to send high-pressure fluid to the second flow path F2 and draw low-pressure fluid from the first flow path F1, is based on the control on the first device Fs side.

[0062] First, refer to Figure 1 The flow of high-pressure fluid into port 1 (P1) and low-pressure fluid out of port 2 (P2) is described. For example... Figure 1 As indicated by the thick arrow, high-pressure fluid flows into the first side space R1 through the first port P1.

[0063] The high-pressure fluid flowing into the first side space R1 flows into the inner flow path of the high-pressure side branch 30 through the first high-pressure side check valve 4. Furthermore, the high-pressure fluid flowing into the first side space R1 is prevented from flowing into the inner flow path of the low-pressure side branch 20 by the first low-pressure side check valve 2.

[0064] High-pressure fluid flowing into the high-pressure side branch 30 flows out from the high-pressure outlet port P4 into the high-pressure flow path S2. Furthermore, the high-pressure fluid flowing into the high-pressure side branch 30 is prevented from flowing into the second side space R2 by the second high-pressure side check valve 5.

[0065] This prevents the high-pressure fluid flowing into the first side space R1 from mixing with the low-pressure fluid.

[0066] like Figure 1 As shown by the thin arrow, the low-pressure fluid flows into the inner flow path of the low-pressure side branch 20 through the low-pressure inlet port P3.

[0067] Low-pressure fluid flowing into the flow path of the low-pressure side branch 20 flows into the second side space R2 through the second low-pressure side check valve 3. Meanwhile, the first low-pressure side check valve 2 is closed by the pressure of the first side space R1 into which the high-pressure fluid flows.

[0068] The low-pressure fluid flowing into the second side space R2 flows out from the second port P2 to the second flow path F2. Furthermore, the second high-pressure side check valve 5 is closed by the pressure within the flow path of the second side arm 33 into which the high-pressure fluid flows.

[0069] This prevents the low-pressure fluid flowing into the second side space R2 from mixing with the high-pressure fluid.

[0070] Just from Figure 1 State transition Figure 2 After the state is reached, that is, after the flow path of the first device Fs side is switched by the control of the first device Fs side, high pressure fluid is sent from the first device Fs to the second flow path F2, and low pressure fluid is drawn from the first flow path F1 to the first device Fs, the pressure of the first flow path F1 that previously flowed into the high pressure fluid decreases.

[0071] The fluid in the first side space R1 flows out through the first port P1 to the first flow path F1, as indicated by the thin arrow. Simultaneously, the pressure in the first side space R1 gradually decreases.

[0072] Even if the pressure in the first side space R1 decreases while the pressure in the flow path inside the high-pressure side branch 30 remains high, the first high-pressure side check valve 4 can prevent fluid from flowing into the first side space R1 from the flow path inside the high-pressure side branch 30. This allows for an efficient reduction in the pressure in the first side space R1.

[0073] Furthermore, the first high-pressure side check valve 4 is closed by the pressure of the flow path inside the high-pressure side branch 30. This prevents fluid in the first side space R1, which is at a lower pressure than the high-pressure fluid, from flowing into the flow path inside the high-pressure side branch 30.

[0074] Furthermore, the first low-pressure side check valve 2 remains closed as long as the pressure in the first side space R1 exceeds the pressure in the flow path within the low-pressure side branch 20. This allows for a more efficient reduction in the pressure of the first side space R1.

[0075] In addition, it prevents fluids with higher pressure than the low-pressure fluid from flowing into the flow path inside the low-pressure side branch 20.

[0076] When the pressure in the first side space R1 becomes lower than the pressure in the flow path within the low-pressure side branch 20, the first low-pressure side check valve 2 opens, allowing low-pressure fluid to flow into the flow path within the low-pressure side branch 20. Figure 2 As indicated by the thin arrow, the fluid flows into the first-side space R1 through the first low-pressure side check valve 2. At this time, the pressure difference between the flow path inside the low-pressure side branch 20 and the pressure in the first-side space R1 is approximately zero.

[0077] On the other hand, the high-pressure fluid sent from the first device Fs to the second flow path F2, such as Figure 2 As shown by the thick arrow, the water flows into the second side space R2 through the second port P2. Simultaneously, the pressure in the second side space R2 gradually increases.

[0078] When the pressure in the second side space R2 rises and becomes higher than the pressure in the flow path inside the low-pressure side branch 20, the second low-pressure side check valve 3 is closed. This prevents fluid from flowing into the second side space R2 from the flow path inside the low-pressure side branch 20, thus efficiently increasing the pressure in the second side space R2.

[0079] Furthermore, the fluid in the second side space R2, which is at a higher pressure than the low-pressure fluid, is prevented from flowing into the inner flow path of the low-pressure side branch 20 by the second low-pressure side check valve 3.

[0080] Furthermore, as long as the pressure in the second side space R2 is less than the pressure in the flow path within the high-pressure side branch 30, the second high-pressure side check valve 5 remains closed. This allows for a more efficient increase in pressure in the second side space R2.

[0081] In addition, it prevents fluids with lower pressure than the high-pressure fluid from flowing into the internal flow path of the high-pressure side branch 30.

[0082] When the pressure in the second side space R2 exceeds the pressure in the flow path of the high-pressure side branch 30, the second high-pressure side check valve 5 opens, and the high-pressure fluid flowing into the second side space R2 passes through the second high-pressure side check valve 5 and flows into the flow path of the high-pressure side branch 30 as indicated by the thick arrow. At this time, the pressure difference between the second side space R2 and the pressure in the flow path of the high-pressure side branch 30 is approximately zero.

[0083] As described above, the differential pressure switching valve V1 is in operation immediately after switching from... Figure 1 State transition Figure 2 Once in this state, no special power is needed to switch control while preventing fluids with different pressures from mixing.

[0084] The above-mentioned switching control is for those who have just switched from Figure 2 State transition Figure 1 After the state, that is, when the flow path on the first device Fs side is switched so that high-pressure fluid is sent from the first device Fs to the first flow path F1 and low-pressure fluid is drawn from the second flow path F2 to the first device Fs, the same applies.

[0085] That is, after the differential pressure switching valve V1 has just switched the flow path on the first device Fs side, causing high-pressure fluid to be delivered from the first device Fs to the first flow path F1 and low-pressure fluid to be drawn from the second flow path F2 to the first device Fs, if the pressure in the first-side space R1 is less than the pressure in the flow path within the high-pressure side branch 30, then the first port P1 and the high-pressure outlet port P4 are disconnected. Subsequently, if the pressure in the first-side space R1 becomes greater than or equal to the pressure in the flow path within the high-pressure side branch 30, then the first port P1 and the high-pressure outlet port P4 are connected.

[0086] Furthermore, after the differential pressure switching valve V1 switches the flow path on the first device Fs side, causing high-pressure fluid to be delivered from the first device Fs to the first flow path F1 and low-pressure fluid to be drawn into the first device Fs from the second flow path F2, if the pressure in the second-side space R2 exceeds the pressure in the flow path within the low-pressure side branch 20, then the second port P2 is disconnected from the low-pressure inflow port P3. Subsequently, if the pressure in the second-side space R2 becomes lower than the pressure in the flow path within the low-pressure side branch 20, then the second port P2 is connected to the low-pressure inflow port P3.

[0087] As described above, the differential pressure switching valve V1, even immediately after switching from...Figure 2 State transition Figure 1 Once in this state, no special power is required to prevent fluids with different pressures from mixing while switching control is performed.

[0088] As explained above, regarding the differential pressure switching valve V1 of this embodiment, the differential pressure opening and closing valve provided in the flow path between the low-pressure inflow port P3 and the first port P1 is the first low-pressure side check valve 2, and the differential pressure opening and closing valve provided in the flow path between the low-pressure inflow port P3 and the second port P2 is the second low-pressure side check valve 3, thus the structure is simple.

[0089] Furthermore, the first low-pressure side check valve 2 is configured to prevent fluid from flowing from the first port P1 to the low-pressure inflow port P3. The second low-pressure side check valve 3 is configured to prevent fluid from flowing from the second port P2 to the low-pressure inflow port P3. Thus, the differential pressure switching valve V1 can switch the flow path connected to the low-pressure inflow port P3 with a simple structure.

[0090] Furthermore, in the differential pressure switching valve V1, the differential pressure opening and closing valve set in the flow path between the high pressure outlet port P4 and the first port P1 is the first high pressure side check valve 4, and the differential pressure opening and closing valve set in the flow path between the high pressure outlet port P4 and the second port P2 is the second high pressure side check valve 5, so the structure is simple.

[0091] Furthermore, the first high-pressure side check valve 4 is positioned to prevent fluid from flowing from the high-pressure outlet port P4 to the first port P1. The second high-pressure side check valve 5 is positioned to prevent fluid from flowing from the high-pressure outlet port P4 to the second port P2. Thus, the flow path connected to the high-pressure outlet port P4 can be switched using a simple structure.

[0092] Furthermore, in the differential pressure switching valve V1, all check valves 2, 3, 4, and 5 are housed within a single housing 1, making installation and removal of the fluid circuit easy. Moreover, the structure is simple, as it consists of a partition wall 16 on the base 10 and four check valves 2, 3, 4, and 5 are configured therein.

[0093] Furthermore, the first side space R1 and the second side space R2 are separated by a partition wall 16. In other words, a pressure higher than atmospheric pressure is exerted on the partition wall 16 from both the first side space R1 and the second side space R2. The pressure difference acting on both sides of the partition wall 16 is less than the pressure difference acting on the peripheral wall of the base member 10, which is positioned facing the atmosphere. As a result, the thickness of the partition wall 16 required to withstand fluid pressure can be made thinner than the thickness of the portion facing atmospheric pressure.

[0094] Furthermore, since the fluid flowing in the first device Fs and the fluid flowing in the second device Ss are of the same type, they can be mixed together as long as the pressure is approximately constant, thus simplifying the switching control of the differential pressure switching valve V1.

[0095] Example 2

[0096] Next, refer to Figure 3 , Figure 4 The differential pressure switching valve of Example 2 will be described. Furthermore, repeated structural descriptions of structures identical to those in the aforementioned examples will be omitted.

[0097] like Figure 3 As shown, in the differential pressure switching valve V2 of this embodiment 2, check valves 4 and 5 are omitted. On the other hand, a differential pressure on / off valve 104 is configured in the high-pressure side branch 130. These points are different from the differential pressure switching valve V1 of the previous embodiment.

[0098] The high-pressure side branch 130 has a neck 131, a first side arm 132, a second side arm 133, an expansion portion 134, and a valve ball 105. The expansion portion 134 and the valve ball 105 constitute a differential pressure on / off valve 104.

[0099] The enlarged diameter portion 134 is formed as a cylindrical shape with two side walls extending in the left-right direction, and its flow path cross-sectional area is larger than the flow path cross-sectional areas of the neck 131, the first side arm 132, and the second side arm 133.

[0100] The neck 131 is a cylindrical shape that protrudes outward from the axial center of the peripheral wall of the enlarged diameter portion 134. The first side arm 132 is formed as a cylindrical shape that extends to the left from the radial center of the left side wall of the enlarged diameter portion 134 and then bends upward at approximately 90 degrees. The second side arm 133 is formed as a cylindrical shape that extends to the right from the radial center of the right side wall of the enlarged diameter portion 134 and then bends upward at approximately 90 degrees.

[0101] Furthermore, a valve ball 105 is disposed in the flow path inside the expansion section 134. The diameter of the valve ball 105 is slightly smaller than the diameter of the flow path inside the expansion section 134, and larger than the flow path cross-sectional area of ​​the neck 131, the first side arm 132, and the second side arm 133.

[0102] If this is the structure, then after the flow path of the first device Fs side is switched by the control of the first device Fs side, so that high-pressure fluid is sent from the first device Fs to the first flow path F1 and low-pressure fluid is drawn into the first device Fs from the second flow path F2, although the pressure in the first side space R1 rises, the pressure in the descending second side space R2 is greater, therefore, referring to... Figure 4 The valve ball 105 seals the flow path between the inner flow path of the first side arm 132 and the inner flow path of the neck 131.

[0103] When the pressure in the rising first side space R1 exceeds the pressure in the falling second side space R2, the valve ball 105 moves axially to the right, as follows: Figure 3 As shown, the flow path between the inner passage of the first side arm 132 and the inner passage of the neck 131 is open, while the flow path between the inner passage of the second side arm 133 and the neck 131 is closed.

[0104] Similarly, after switching the flow path on the first device Fs side, causing high-pressure fluid to be delivered from the first device Fs to the second flow path F2 and low-pressure fluid to be drawn into the first device Fs from the first flow path F1, although the pressure in the second-side space R2 increases, the pressure in the first-side space R1, which is decreasing, is greater. Therefore, referring to... Figure 3 The valve ball 105 seals the flow path between the second side arm 133 and the neck 131.

[0105] When the pressure in the rising second side space R2 exceeds the pressure in the falling first side space R1, the valve ball 105 moves axially to the left, as follows: Figure 4 As shown, the flow path between the inner flow path of the second side arm 133 and the inner flow path of the neck 131 is open, while the flow path between the inner flow path of the first side arm 132 and the neck 131 is closed.

[0106] In this way, the differential pressure switching valve V2 can perform switching control while preventing fluids with different pressures from mixing without the need for special power.

[0107] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and changes and additions that do not depart from the spirit of the present invention are also included in the present invention.

[0108] For example, in the aforementioned Embodiment 1 and Embodiment 2, the structure of the differential pressure switching valve being installed between the first device for pressurizing the fluid and the second device for depressurizing the fluid was described. However, it is not limited to this. A third device may also be installed between the first device and the second device, and the structure of the fluid circuit may be appropriately modified.

[0109] Furthermore, in the aforementioned Embodiments 1 and 2, the structure in which all differential pressure on / off valves are arranged in one housing was described, but it is not limited to this and can also be arranged in multiple housings.

[0110] Furthermore, in the aforementioned Embodiments 1 and 2, a structure in which the space inside the shell is divided by one partition wall was described, but this is not a limitation; the space inside the shell may also be divided by two or more partition walls. Moreover, when two or more partition walls are provided, it is preferable to use a structure in which heat-insulating material is filled in the space between the partition walls, or a vacuum is created, to prevent heat exchange between the fluid flowing into the first side space and the fluid flowing into the second side space.

[0111] Label Explanation

[0112] 1: Housing; 2: First low-pressure side check valve (differential pressure on / off valve); 3: Second low-pressure side check valve (differential pressure on / off valve); 4: First high-pressure side check valve (differential pressure on / off valve); 5: Second high-pressure side check valve (differential pressure on / off valve); 16: Partition wall; 104: Differential pressure on / off valve; F1: First flow path; F2: Second flow path; Fs: First device; P1: First port; P2: Second port; P3: Low-pressure inlet port; P4: High-pressure outlet port; R1: First side space; R2: Second side space; S1: Low-pressure flow path; S2: High-pressure flow path; Ss: Second device; V1, V2: Differential pressure switching valve.

Claims

1. A differential pressure switching valve, comprising a low-pressure inlet port, a high-pressure outlet port, a first port, and a second port. Differential pressure on / off valves are respectively installed in the flow path between the low-pressure inflow port and the first port, and in the flow path between the low-pressure inflow port and the second port. The high-pressure outlet port is connected to the first port and the second port. The differential pressure switching valve is equipped with a differential pressure on / off valve that switches the flow path to the high-pressure outlet port according to the pressure of the first port and the second port.

2. The differential pressure switching valve according to claim 1, wherein, The differential pressure on / off valve located in the flow path between the low-pressure inflow port and the first port, and the differential pressure on / off valve located in the flow path between the low-pressure inflow port and the second port, are both check valves.

3. The differential pressure switching valve according to claim 2, wherein, The two check valves are configured to prevent flow from the first port and the second port into the low-pressure inflow port.

4. The differential pressure switching valve according to claim 1, wherein, The differential pressure on / off valve is a check valve that is respectively installed in the flow path between the high pressure outlet port and the first port, and in the flow path between the high pressure outlet port and the second port.

5. The differential pressure switching valve according to claim 4, wherein, The two check valves are configured to prevent flow from the high-pressure outlet port into the first port and the second port.

6. The differential pressure switching valve according to any one of claims 1 to 5, wherein, All of the differential pressure on / off valves are housed in a single housing.

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